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Chrysler Repair/'05 300C: no communication with TCM


QUESTION: i have a 2005 chrysler 300c w hemi i got n error code that tcm not communicating i replaced fuse n tcm module but still getting the esp n bas light still on, n tcm is still not communicating i tried disconnecting battery n resetting it way owners mannual says but still n car wont go over 40 miles per hr n errors r still thee please help  im lost

ANSWER: Let me finish breakfast and then get right back to you, Edward.

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QUESTION: Roland thank you 4 quick response i 4 got to mention i also took it to a shop to have it flashn b4 i put in new tcm n it said cant be flashed tcm not communicating the mechanic showed me on the snap on device he was going flash it with he told me check loose wires near trans is nothing please let me know after breakfast i rated u already

ANSWER: Hi David,
The wires to the transmission control module that you need to verify are:
The pink/black from fuse 57 to pin 29 of the black 18-way plugof the tcm, and that the wire shows 12V to be present when the key is in the 'run' position.
The black/orange from pin 30 of that same plug is grounded.
There are a twisted pair of wires (white/light green, white/light blue) on the 14-way black plug of the tcm at pin H1 and L2 and those have to be connected to pins 34 and 35 of the black 38-pin plug at the powertrain control module, and also to pina 8 and 9 of the black 24-pin plug of the front control module. Those twisted wires are carrying the information from the tcm to the pcm so and from there to the snap-on and so they need to be properly connected if it is to communicate with the tcm.
Thanks for the rating and nomination.

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QUESTION: my other ? is why the Bas/Esp light stay on will it go off after tcm is fixed

That light(s) has to do with the anti-lock brake system. I see in the manual it is about Brake Assist and about Electronic Stability Program, but I see no relationship between those functions and the transmission. So I think fixing the tcm will not change the status of that light.
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Roland Finston


Get a Free Fast answer to your repair question about a Chrysler/Dodge/Plymouth car, minivan, SUV, or truck. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty. This free troubleshoot advice forum helps you diagnose faults, minimize repair costs or do-it-yourself.

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I have do-it-yourself experience (50+ years) and a library of 100 1982-2012 Chrysler factory shop manuals and 20 multi-manual Chrysler Corp. CD's.

I was voted "Top Expert" 2010-2015, here at AllExperts, and have answered 20,000+ questions.


Five decades as a 'do-it-yourselfer' on domestic and imported cars.

Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)

Advanced degrees in Physics/bruised knuckles

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"Top expert" of 2010, 2011, 2012, 2013, 2014 and 2015 here at Allexperts. Quickest "average response time" at Allexperts (currently no. 1).

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